18696913 has 2 divisors, whose sum is σ = 18696914. Its totient is φ = 18696912.

The previous prime is 18696901. The next prime is 18696917. The reversal of 18696913 is 31969681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15499969 + 3196944 = 3937^2 + 1788^2 .

It is a cyclic number.

It is not a de Polignac number, because 18696913 - 2¹³ = 18688721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18696913.

It is not a weakly prime, because it can be changed into another prime (18696917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9348456 + 9348457.

It is an arithmetic number, because the mean of its divisors is an integer number (9348457).

Almost surely, 2^18696913 is an apocalyptic number.

It is an amenable number.

18696913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18696913 is an equidigital number, since it uses as much as digits as its factorization.

18696913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 43.

The square root of 18696913 is about 4323.9927150725. The cubic root of 18696913 is about 265.4136792710.

The spelling of 18696913 in words is "eighteen million, six hundred ninety-six thousand, nine hundred thirteen".